NO811635L - PROCEDURE FOR PREPARING A POLYMER. - Google Patents
PROCEDURE FOR PREPARING A POLYMER.Info
- Publication number
- NO811635L NO811635L NO811635A NO811635A NO811635L NO 811635 L NO811635 L NO 811635L NO 811635 A NO811635 A NO 811635A NO 811635 A NO811635 A NO 811635A NO 811635 L NO811635 L NO 811635L
- Authority
- NO
- Norway
- Prior art keywords
- polymer
- product
- film
- residence time
- stream
- Prior art date
Links
- 229920000642 polymer Polymers 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 19
- 238000003860 storage Methods 0.000 claims abstract description 12
- 238000004519 manufacturing process Methods 0.000 claims abstract description 10
- 239000007787 solid Substances 0.000 claims abstract description 5
- 239000002245 particle Substances 0.000 claims description 17
- -1 polypropylene Polymers 0.000 claims description 6
- 238000006243 chemical reaction Methods 0.000 claims description 5
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 238000009826 distribution Methods 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 238000007689 inspection Methods 0.000 claims description 3
- 229920001155 polypropylene Polymers 0.000 claims description 3
- 239000004743 Polypropylene Substances 0.000 claims description 2
- 238000005070 sampling Methods 0.000 abstract description 7
- 238000012544 monitoring process Methods 0.000 abstract description 2
- 239000000047 product Substances 0.000 abstract 10
- 239000006227 byproduct Substances 0.000 abstract 1
- 239000000499 gel Substances 0.000 description 9
- 239000008187 granular material Substances 0.000 description 6
- 239000007863 gel particle Substances 0.000 description 4
- 239000000463 material Substances 0.000 description 4
- 239000000178 monomer Substances 0.000 description 4
- 239000000155 melt Substances 0.000 description 3
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 2
- 239000005977 Ethylene Substances 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 229920001577 copolymer Polymers 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000006116 polymerization reaction Methods 0.000 description 2
- QQONPFPTGQHPMA-UHFFFAOYSA-N propylene Natural products CC=C QQONPFPTGQHPMA-UHFFFAOYSA-N 0.000 description 2
- 125000004805 propylene group Chemical group [H]C([H])([H])C([H])([*:1])C([H])([H])[*:2] 0.000 description 2
- 239000002994 raw material Substances 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- 238000011179 visual inspection Methods 0.000 description 2
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000003054 catalyst Substances 0.000 description 1
- 238000003776 cleavage reaction Methods 0.000 description 1
- 238000010924 continuous production Methods 0.000 description 1
- 238000004132 cross linking Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 229920001903 high density polyethylene Polymers 0.000 description 1
- 239000004700 high-density polyethylene Substances 0.000 description 1
- 239000003999 initiator Substances 0.000 description 1
- 229920001684 low density polyethylene Polymers 0.000 description 1
- 239000004702 low-density polyethylene Substances 0.000 description 1
- 229920001179 medium density polyethylene Polymers 0.000 description 1
- 239000004701 medium-density polyethylene Substances 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 229920000098 polyolefin Polymers 0.000 description 1
- 230000007017 scission Effects 0.000 description 1
- 238000010998 test method Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29B—PREPARATION OR PRETREATMENT OF THE MATERIAL TO BE SHAPED; MAKING GRANULES OR PREFORMS; RECOVERY OF PLASTICS OR OTHER CONSTITUENTS OF WASTE MATERIAL CONTAINING PLASTICS
- B29B13/00—Conditioning or physical treatment of the material to be shaped
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/25—Component parts, details or accessories; Auxiliary operations
- B29C48/92—Measuring, controlling or regulating
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/9258—Velocity
- B29C2948/926—Flow or feed rate
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92504—Controlled parameter
- B29C2948/92609—Dimensions
- B29C2948/92657—Volume or quantity
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92876—Feeding, melting, plasticising or pumping zones, e.g. the melt itself
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C2948/00—Indexing scheme relating to extrusion moulding
- B29C2948/92—Measuring, controlling or regulating
- B29C2948/92819—Location or phase of control
- B29C2948/92857—Extrusion unit
- B29C2948/92904—Die; Nozzle zone
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/07—Flat, e.g. panels
- B29C48/08—Flat, e.g. panels flexible, e.g. films
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
- B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
- B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
- B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
- B29C48/09—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels
- B29C48/10—Articles with cross-sections having partially or fully enclosed cavities, e.g. pipes or channels flexible, e.g. blown foils
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Processing And Handling Of Plastics And Other Materials For Molding In General (AREA)
- Addition Polymer Or Copolymer, Post-Treatments, Or Chemical Modifications (AREA)
- Extrusion Moulding Of Plastics Or The Like (AREA)
- Sampling And Sample Adjustment (AREA)
- Macromolecular Compounds Obtained By Forming Nitrogen-Containing Linkages In General (AREA)
- Polymers With Sulfur, Phosphorus Or Metals In The Main Chain (AREA)
- Investigating Or Analyzing Non-Biological Materials By The Use Of Chemical Means (AREA)
- Polymerisation Methods In General (AREA)
Abstract
Description
Foreliggende oppfinnelse vedrører en fremgangsmåte ved fremstilling av en polymer fulgt ved kontinuerlig inspeksjon av polymerkvaliteten og etterfølgende lagring av polymer. The present invention relates to a method for the production of a polymer followed by continuous inspection of the polymer quality and subsequent storage of the polymer.
Ved kontinuerlig fremstilling av polymerer er det nødvendigIn the continuous production of polymers, it is necessary
å foreta regelmessig analyse av kvaliteten av det erholdte produkt, slik at produktets avvik fra de gitte spesifikasjoner kan påvises i tide og korrigeres. to carry out regular analysis of the quality of the product obtained, so that the product's deviation from the given specifications can be detected in time and corrected.
Fortrinnsvis gjøres dette kontinuerlig. Eksempelvis ved fremstilling av LD-polyetylen gjøres dette i realiteten ved hjelp av smelteindexen. Av polymersmelten som kommer ut fra reaksjonsseksjonen i ekstruderen, blir smelteindexen målt.. Pro-sessen blir deretter kontrollert i avhengighet av analyse-resultatene. Dette kan gjøres manuelt eller direkte ved en regnemaskin uten menneskelig inngripen. Preferably, this is done continuously. For example, in the production of LD polyethylene, this is actually done using the melt index. Of the polymer melt that comes out of the reaction section in the extruder, the melt index is measured. The process is then controlled depending on the analysis results. This can be done manually or directly by a calculator without human intervention.
Etter polymerisering ekstruderes polymeren og granuleres, hvoretter de erholdte' granuler blandes og transporteres til lager. Passasje gjennom disse seksjoner kan enkelte ganger resultere i forurensning av polymeren. Alvorlig forurensning, i form av oksydert eller forkullet polymer kan allerede påvises ved visuell inspeksjon av granulene. After polymerization, the polymer is extruded and granulated, after which the obtained granules are mixed and transported to storage. Passage through these sections can sometimes result in contamination of the polymer. Serious contamination, in the form of oxidized or charred polymer, can already be detected by visual inspection of the granules.
Det er imidlertid umulig å bestemme polymerens bearbeidbarhet ved visuell inspeksjon av granulene. I tillegg vil inspeksjon for tilstedeværelse av gelpartikler i polymeren representere et problem. However, it is impossible to determine the processability of the polymer by visual inspection of the granules. In addition, inspection for the presence of gel particles in the polymer will represent a problem.
Problemet er at tilstedeværelse av gelpartikler kan ikke påvises av granulatets utseende. Små mengder polymer besitter en molekylstruktur som avviker fra den fra hovedmengden av materialet. Avvik i molekylvekt eller molekylvekts fordeling kan forårsake polymerspaltning, fornetning eller oksydasjon. Som en følge vil de såkalte gelpartikler utvise avvikende strømningsegenskaper. Disse avvikende strømningsegenskaper The problem is that the presence of gel particles cannot be detected by the appearance of the granules. Small amounts of polymer possess a molecular structure that differs from that of the bulk of the material. Deviations in molecular weight or molecular weight distribution can cause polymer cleavage, cross-linking or oxidation. As a result, the so-called gel particles will exhibit deviant flow properties. These deviant flow characteristics
er av betydning spesielt når polymeren bearbeides til en film. Gelpartiklene deformerer filmen i deres direkte om- is of particular importance when the polymer is processed into a film. The gel particles deform the film in their direct re-
givelser og kan således klart observeres optisk.givings and can thus be clearly observed optically.
Deres størrelse kan variere fra 100 um til 1 cm. I tillegg kan disse.partikler forårsake dannelse av hull og eventuelt brudd i filmen. Their size can vary from 100 µm to 1 cm. In addition, these particles can cause the formation of holes and eventual breaks in the film.
Polymer som er kjent å være beheftet med dette problem er polyolefiner så som polymere av etylen og propylen eller kopolymere av disse monomere med andre monomere. Polymers known to be affected by this problem are polyolefins such as polymers of ethylene and propylene or copolymers of these monomers with other monomers.
Polymerene blir vanligvis overvåket for tilstedeværelse av geler ved "off-line" bearbeiding av granulatet til film. Spesielt trenede laboratorieteknikere bestemmer visuelt gel-nivået, bestemmer bearbeidbarhet til film og den minimale filmtykkelse samt inspiserer materialet m.h.tv tilstedeværelse av hull- eller brudd etc. The polymers are usually monitored for the presence of gels during "off-line" processing of the granules into film. Specially trained laboratory technicians visually determine the gel level, determine workability to film and the minimum film thickness, as well as inspect the material with regard to the presence of holes or breaks etc.
Som følge av dette vil visuelt gellnnholdbestemmelser være særpreget ved subjektivitet og derav følgende begrenset re-produserbarhet og nøyaktighet.- As a result of this, visual content regulations will be characterized by subjectivity and consequently limited reproducibility and accuracy.
Det finnes analytisk utstyr med hvilket gelinnholdet i en film kan måles kontinuerlig. Anvendelse av dette utstyr forbedrer betydelig reproduserbarheten og nøyaktigheten av denne prøve-metode. There is analytical equipment with which the gel content in a film can be measured continuously. Use of this equipment significantly improves the reproducibility and accuracy of this test method.
Imidlertid selv om det er mulig å kontrollere prosessparamet-rene ved å overvåke polymerens smelteindeks, er det ikke mulig å kontrollere (eller nedsette) gelinnholdet av polymerene ved å forandre prosessbetingelsene. Likevel er gelinnholdet som operatøren opplyses om nyttig informasjon m.h.t. kvaliteten og som man kan anvende ved valg av granulat. However, although it is possible to control the process parameters by monitoring the melt index of the polymer, it is not possible to control (or reduce) the gel content of the polymers by changing the process conditions. Nevertheless, the gel content that the operator is informed about is useful information regarding the quality and which can be used when choosing granules.
Da, som indikert ovenfor, bearbeiding til film og bestemmelse av gelinnholdet finner sted "off-line", er det umulig for små satser med avvikende produkt-spesifikasjoner, så som dårlig filmegenskaper, at disse isoleres i tide før blanding og lagring. Som følge av dette vil vesentlig større polymer- mengder refuseres på basis av deres spesifikasjoner enn det som hadde vært nødvendig hvis den avvikende aktuelle del kunne blitt isolert i tide. Hensikten med foreliggende oppfinnelse er derfor å tilveiebringe en fremgangsmåte som gjør det mulig kontinuerlig å bestemme kvaliteten av en fremstilt polymer og om nødvendig isolere polymeren med utilfredsstil-lende kvalitet før denne blandes og lagres. Since, as indicated above, processing into film and determination of the gel content takes place "off-line", it is impossible for small batches with deviating product specifications, such as poor film properties, to be isolated in time before mixing and storage. As a result, substantially larger quantities of polymer will be rejected on the basis of their specifications than would have been necessary if the deviating part in question could have been isolated in time. The purpose of the present invention is therefore to provide a method which makes it possible to continuously determine the quality of a manufactured polymer and, if necessary, to isolate the polymer with unsatisfactory quality before it is mixed and stored.
Foreliggende fremgangsmåte er særpreget ved at en prøvestrøm utstrekkes kontinuerlig fra strømmen av de faste polymerpartikler og analysere denne prøvestrøm hvoretter strømmen av polymerpartikler, etter avtrekning av prøvestrømmen, føres til en bunker hvis oppholdstid er lik den tid som er nøvend-ig for analyse, hvoretter strømmen av polymerpartikler som forlater oppholdstidsbunkeren transporteres ytterligere avhengig av analyseresultatet. The present method is characterized by the fact that a sample flow is extended continuously from the flow of the solid polymer particles and this sample flow is analysed, after which the flow of polymer particles, after subtraction of the sample flow, is led to a bunker whose residence time is equal to the time required for analysis, after which the flow of polymer particles leaving the residence time bunker are further transported depending on the analysis result.
Det foretrekkes at prøvestrømmen føres til en ekstruder hvoretter det fremstilles' en film av strømmen, hvoretter denne film analyseres. Analysen kan utføres ved hj:elp av en gelteller, en klarhetsmåler, ehglansmåler etc. og kan ut- It is preferred that the sample stream is fed to an extruder, after which a film is produced from the stream, after which this film is analysed. The analysis can be carried out with the help of a gel counter, a clarity meter, gloss meter etc. and can
føres på en støpt eller blåst film.is carried on a cast or blown film.
Det er funnet at ved foreliggende fremgangsmåte muliggjøres separasjon av polymer som ikke tilfredsstiller spesifikasjonene fra resten av polymeren på en meget enkel måte, slik at den prosentvise andel av produktet som må tilbakevises ved den endelige sluttindeksjon på basis av spesifikasjonene senkes betydelig. Oppholdstidbunkeren må i denne forbindelse forstås å være en bunker, en silo e.l. anordning i hvilken strømmen av polymerpartiklene som føres gjennom bunkeren har en konstant oppholdstid uten at det oppstår noen betydelig blanding av produktet. Som oppholdstidbunker kan eksempelvis anvendes en normal lagringsbunker med en konisk bunn, idet utførselsåpningen i bunkeren modifiseres på en slik måte at det i det vesenlige ikke finner sted noen blanding av produktet. En annen og mer kostbar løsning kan være å anvende én lang transportlinje hvori en tilstrekkelig lang oppholdstid dannes. Prøvetakning av strømmen av polymerpartiklene kan finne sted på kjent måte, eksempelvis i US patent nr. 3.293.918. It has been found that the present method enables the separation of polymer that does not satisfy the specifications from the rest of the polymer in a very simple way, so that the percentage of the product that must be rejected at the final final indexation on the basis of the specifications is significantly lowered. The residence time bunker must in this connection be understood to be a bunker, a silo etc. device in which the flow of the polymer particles that are passed through the bunker has a constant residence time without any significant mixing of the product occurring. As a residence time bunker, a normal storage bunker with a conical bottom can be used, for example, as the outlet opening in the bunker is modified in such a way that essentially no mixing of the product takes place. Another and more expensive solution could be to use one long transport line in which a sufficiently long dwell time is created. Sampling of the flow of the polymer particles can take place in a known manner, for example in US patent no. 3,293,918.
Foreliggende fremgangsmåte anvendes fortrinnsvis ved fremstilling av høy-, middels- og lav-densitets polyetylen eller av polypropylen, innbefattende kopolymere av etylen og propylen med hverandre eller andre monomere og spesielt ved fremstilling av polyetylen under høyt trykk (500-7000 bar). The present method is preferably used in the production of high-, medium- and low-density polyethylene or polypropylene, including copolymers of ethylene and propylene with each other or other monomers and especially in the production of polyethylene under high pressure (500-7000 bar).
Oppfinnelsen omfatter også en installasjon for fremstilling av polymer omfattende bl.a. eri. reaksjonsseksjon og en transportlinje for transport av en strøm av fast polymerpartikler fra reaksjonsseksjonen til en lagermulighet. Installasjonen ifølge oppfinnelsen er. særpreget ved at transportlinjen er forsynt med en prøvetagningsanordning, hvilken anordning via en transportlinje er forbundet med et analyseutstyr som kan overføre et signal til en fordelingsanordning i lageret, The invention also includes an installation for the production of polymer comprising, among other things, am in. reaction section and a conveyor line for transporting a stream of solid polymer particles from the reaction section to a storage facility. The installation according to the invention is. characterized by the fact that the transport line is equipped with a sampling device, which device is connected via a transport line to an analysis device that can transmit a signal to a distribution device in the warehouse,
idet en oppholdstidbunker er anordnet i transportlinjen mellom prøvetagningspunktet og"lageret. as a residence time bunker is arranged in the transport line between the sampling point and the "storage".
Oppfinnelsen skal nu belyses under henvisning til tegningene, hvori: Fig. 1 representerer fremgangsmåten ifølge oppfinnelsen i.form av et blokkdiagram, og Fig. 2 viser skjematisk prøvetagning og etterfølgende analyse av prøven. The invention will now be explained with reference to the drawings, in which: Fig. 1 represents the method according to the invention in the form of a block diagram, and Fig. 2 schematically shows sampling and subsequent analysis of the sample.
I henhold til fig. 1 innmates råmateriale til en polymerisa-sjonsenhet 2 via en tilførselsledning 1. Dette råmaterialet innbefatter monomere, initator eller katalysator, og ytterligere materialer så som antioksydanter. Via ledningen 3 strømmer partikler til•prøvetagningspunktet 4. Via ledningen 5 føres prøven til et analyseutstyr 6, indikert i form av en blokk. Hovedstrømmen av polymerpartiklene føres inn i oppholdstidbunkeren 8 via ledning 7. Bunnen av denne bunker 8 er forsynt med en fordelingsventil 10 som kontrolleres ved et signal via transmisjonslinjen 9. Avhengig av signalets natur, vil produktet føres fra bunkeren til lagringsbunkeren 12 via rørledningen 11, hvis materiale tilfredsstiller spesifikasjonene eller til lagringsbunkeren 14 via ledningen 13, hvis produktet ikke tilfredsstiller spesifikasjonene. According to fig. 1 raw material is fed into a polymerization unit 2 via a supply line 1. This raw material includes monomers, initiator or catalyst, and further materials such as antioxidants. Via the line 3, particles flow to the sampling point 4. Via the line 5, the sample is taken to an analysis device 6, indicated in the form of a block. The main flow of the polymer particles is fed into the residence time bunker 8 via line 7. The bottom of this bunker 8 is provided with a distribution valve 10 which is controlled by a signal via the transmission line 9. Depending on the nature of the signal, the product will be fed from the bunker to the storage bunker 12 via the pipeline 11, if material meets the specifications or to the storage bunker 14 via the line 13, if the product does not meet the specifications.
Oppholdstiden i bunkeren 8 er så lang at signalet, som ved et visst tidspunkt når ventilen 10 via 9 kommer fra prøven som taes fra produktet som passerer ventilen på det samme tidspunkt. Eventuelt kan det innarbeides en liten sikkerhetsmargin for å kompensere for en liten spredning i oppholdstiden og i det analytiske utstyr 6 og/eller bunkeren 8. Denne sikkerhetsmargin kan gå opptil 10% av den totale oppholdstid. The residence time in the bunker 8 is so long that the signal, which at a certain time when the valve 10 via 9 comes from the sample taken from the product that passes the valve at the same time. If necessary, a small safety margin can be incorporated to compensate for a small spread in the residence time and in the analytical equipment 6 and/or the bunker 8. This safety margin can be up to 10% of the total residence time.
I fig. 2 er vist mere detaljert en utførelsesform av prøve-anordningen og det analytiske utstyr. Via rørledningen 3 når en strøm av polymerpartikler prøvetagningspunktet 4. Via rørledningen 21, injektoren 22-, blåseren 23 og rørledningen 24 føres en liten del av strømmen av polymerpartiklene til syklonen 25. Etter separasjon fra transportluften passerer polymerpartiklene gjennom rørledningen 26 til ekstruderen 27, hvor polymerpartiklene smeltes og ekstruderes til en film. Filmen transporteres deretter til apparatet 28 hvor den analyseres ved hjelp av måleapparatet 29. Signalet fra 29 sendes til ventilen 10 evt. via et signalbehandlingsutstyr. In fig. 2 shows in more detail an embodiment of the test device and the analytical equipment. Via the pipeline 3, a flow of polymer particles reaches the sampling point 4. Via the pipeline 21, the injector 22, the blower 23 and the pipeline 24, a small part of the flow of the polymer particles is led to the cyclone 25. After separation from the transport air, the polymer particles pass through the pipeline 26 to the extruder 27, where the polymer particles are melted and extruded into a film. The film is then transported to the device 28 where it is analyzed using the measuring device 29. The signal from 29 is sent to the valve 10 possibly via a signal processing device.
Filmen blir deretter utført til en avfallsbeholder via injektoren 30 og blåseanordningen 31. The film is then carried to a waste container via the injector 30 and the blowing device 31.
EKSEMPEL OG SAMMENLIGNINGSEKSEMPELEXAMPLE AND COMPARISON EXAMPLE
Utstyr beskrevet i tegningen ble undersøkt under anvendelse av et geltellerapparat som analytisk utstyr i et anlegg for fremstilling av LD-polyetylen i en 6-måneders periode. Prosentandelen av produktet som ble forkastet på basis av foreliggende fremgangsmåte utgjorde ca. 1,25 vektprosent. Equipment described in the drawing was examined using a gel counter as analytical equipment in a plant for the manufacture of LD polyethylene over a 6-month period. The percentage of the product that was rejected on the basis of the present method amounted to approx. 1.25% by weight.
I en sammenligningsperiode under hvilken foreliggende fremgangsmåte ikke ble anvendt, og hvor sammenlignbare produkter ble fremstilt var vrakprosenten på basis av gelinnholdet ca. 3 vektprosent. In a comparison period during which the present method was not used, and where comparable products were produced, the scrap percentage on the basis of the gel content was approx. 3 percent by weight.
Claims (6)
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| NL8002782A NL8002782A (en) | 1980-05-14 | 1980-05-14 | METHOD FOR PREPARING A POLYMER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| NO811635L true NO811635L (en) | 1981-11-16 |
Family
ID=19835293
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| NO811635A NO811635L (en) | 1980-05-14 | 1981-05-13 | PROCEDURE FOR PREPARING A POLYMER. |
Country Status (10)
| Country | Link |
|---|---|
| US (1) | US4442054A (en) |
| EP (1) | EP0039983B1 (en) |
| JP (1) | JPS5710602A (en) |
| AT (1) | ATE7119T1 (en) |
| AU (1) | AU7026381A (en) |
| BR (1) | BR8102976A (en) |
| CA (1) | CA1167280A (en) |
| DE (1) | DE3163171D1 (en) |
| NL (1) | NL8002782A (en) |
| NO (1) | NO811635L (en) |
Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4756855A (en) * | 1986-04-04 | 1988-07-12 | Phillips Petroleum Company | Automatic method for sorting plastic pellets |
| US4781559A (en) * | 1986-04-04 | 1988-11-01 | Phillips Petroleum Company | Plastic pellet sorting apparatus with extruded side-stream monitoring |
| JPH0213852A (en) * | 1988-07-01 | 1990-01-18 | Shin Etsu Chem Co Ltd | Quality inspection method for modifiers for vinyl chloride resins |
| FI85191C (en) * | 1990-06-07 | 1992-03-10 | Neste Oy | ADJUSTMENT OF THE MEASURE ATT TA PROV. |
| JPH0753019Y2 (en) * | 1991-03-19 | 1995-12-06 | アスカ工業株式会社 | Sampling valve |
| US5383776A (en) * | 1992-12-31 | 1995-01-24 | Hoechst Celanese Corporation | Apparatus for analyzing polymer defects |
| SE514090C2 (en) * | 1999-04-12 | 2000-12-18 | Photonic Systems Ab | Process and system for detecting impurities in a transparent material |
| CN111512137B (en) * | 2018-01-19 | 2023-04-28 | 巴塞尔聚烯烃意大利有限公司 | Device and method for taking a sample from a unit of a polymerization plant |
Family Cites Families (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3030665A (en) * | 1958-03-05 | 1962-04-24 | Eagleton Sidney Douglas | Refining thermoplastic resins |
| US3293918A (en) * | 1964-05-07 | 1966-12-27 | Phillips Petroleum Co | Thermoplastic material sampling |
| DE1276324B (en) * | 1965-10-21 | 1968-08-29 | Hoechst Ag | Extrusion line with head pelletizing and water cooling |
| US3593011A (en) * | 1968-05-09 | 1971-07-13 | Exxon Research Engineering Co | Analogue control device for chemical processes |
| US3608001A (en) * | 1969-08-26 | 1971-09-21 | Exxon Research Engineering Co | Controlled degradation of polypropylene in extruder-reactor |
| US4137754A (en) * | 1975-07-24 | 1979-02-06 | Mobil Oil Corporation | Melt rheometer for the measurement of flow properties of foamable plastics and polymer compositions |
| US4233255A (en) * | 1978-11-29 | 1980-11-11 | Measurex Corporation | Method for controlling the thickness or weight of extruded stock |
-
1980
- 1980-05-14 NL NL8002782A patent/NL8002782A/en not_active Application Discontinuation
-
1981
- 1981-05-08 AU AU70263/81A patent/AU7026381A/en not_active Abandoned
- 1981-05-13 BR BR8102976A patent/BR8102976A/en unknown
- 1981-05-13 NO NO811635A patent/NO811635L/en unknown
- 1981-05-14 AT AT81200515T patent/ATE7119T1/en not_active IP Right Cessation
- 1981-05-14 JP JP7283781A patent/JPS5710602A/en active Pending
- 1981-05-14 CA CA000377551A patent/CA1167280A/en not_active Expired
- 1981-05-14 EP EP81200515A patent/EP0039983B1/en not_active Expired
- 1981-05-14 DE DE8181200515T patent/DE3163171D1/en not_active Expired
- 1981-05-14 US US06/263,731 patent/US4442054A/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| BR8102976A (en) | 1982-02-02 |
| EP0039983B1 (en) | 1984-04-18 |
| AU7026381A (en) | 1981-11-19 |
| NL8002782A (en) | 1981-12-16 |
| DE3163171D1 (en) | 1984-05-24 |
| ATE7119T1 (en) | 1984-05-15 |
| JPS5710602A (en) | 1982-01-20 |
| EP0039983A1 (en) | 1981-11-18 |
| CA1167280A (en) | 1984-05-15 |
| US4442054A (en) | 1984-04-10 |
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